9/27/2023 0 Comments Newtons third law of motion![]() The underlying concept presented is quite general and can be directly apply to many other physical settings. In all cases, this combined entity perpetually accelerates towards the direction of the negative-mass component until relativistic saturation effects from the band edges come into play. The formation of such a mass/anti-mass self-accelerating state is shown below. ![]() The interaction force between these wavepackets was provided by means of Kerr nonlinearity. To excite such a selfaccelerating bound state, two pulses (having opposite masses), were launched in close proximity to each other. Given that the effective photon “mass” in these two bands is equal and opposite, one could then anticipate optical diametric drive acceleration effects to take place. This periodic arrangement ultimately leads to two photonic bands. Ulf Peschel’s team from the University of Erlangen-Nuernberg in Germany, have demonstrated this effect using optical pulses in a figure-8, fiber-optic platform (Fig. In a recent study (Nature Physics, 9, 780 (2013)), the group of Prof. ![]() Of course, in the absence of negative mass particles, no such acceleration behavior that breaks the action-reaction symmetry has ever been reported. In fact, in this regime, an intriguing scenario arises whenever the two masses are equal and opposite under these conditions, two interacting bodies will indefinitely accelerate in the same direction while keeping a constant distance among themselves Interestingly, this possibility was first speculated within the context of “diametric drive” that could itself provide a possible mechanism for space propulsion. However, this situation completely changes if hypothetically one of the masses is negative. This is true as long as the masses of the two particles involved are positive, which is of course the case in mechanics. Combined with the second law of motion, this implies that two classical bodies are expected to accelerate either towards or away from each other, but never in the same direction. Newton’s third law states that the action-reaction forces involved in an elemental two-body interaction must be equal and opposite.
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